Adults with sickle cell anemia often are slender or small in size . Vision problems . The retina , a thin layer of tissue at the back of the eye , receives and processes visual images . When the retina does not get enough blood , it can weaken and cause problems . Causes Sickle cell anemia is caused by a mistake in the gene that tells your body to make hemoglobin - the red , iron-rich protein that gives blood its red color . Hemoglobin is a component of...











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